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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93b680d43cb8f7faccd8bb7839650fb51379f3a17f22211ad242ce387f921334' 
  AND token = '3nMwe06Gtak4BiBC2jrHjd8zyz23dwqTTMeMVSMfeQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}