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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41e52a8bae7a20ecd0355fb582a06bff08802e648b9e3df843853aaa35944fac' 
  AND token = 'oUxKa8AoYPwyfMEQSm2AZWLO/fL1p+xxV0478wtpV9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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