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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2be44d2eac49fd61593cda52b3e8a82ae209baa634e33a24d02af0d5a5f87f24' 
  AND token = '+vMudwYYXbeAUQacuQ8gAJNAGF7LJMvY92VajV30gCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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