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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fc7761134c47c622ec194022e995244e0236d1147b71606f89840c81b39cfd1' 
  AND token = 'vO6PS0hwGwvt6UNTvvcMSY8B5DlBVjTXsi1KzyW1HKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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