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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '293d0e4584b80f35d81b5c26ae99a5483e0b134f913d2116ef9aa27290d0cb0a' 
  AND token = '+EKHcjCSvmArQGJ5PChSgtfECM6dhl8neGn9k4dElPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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