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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8631e5a526fe5c616cca891ba4dc678eed35b4fddeabaf07d97160a19c97e78d' 
  AND token = 'Y1t8V1H8Gi0JnFGjPk7Y7Kn1Ao4mAMVVjvUlwPHPBto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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