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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '945d4113379ba69834ec6f965d8d6036ebc277b625e39ce2eaef764a16ae418e' 
  AND token = 'gI8h1MY+Q3enJJ2kG2S+Q7Co32Xf1WipF2Wq8oLaNEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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