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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab883db748aee5fb6d8f2655a85d94c9b5a80b76a774e6e617d3ed0e37e410e8' 
  AND token = '4TcDDLJS67mdRkGJjUHC/M6lqZMSELKLHgb5ZSlHI5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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