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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b8f5ef6b1ae1ad28b33795cb45284312eab7a1634706ee819580d533ff14817' 
  AND token = 'od2Ih20jabT8MCEMCK/8w+23N5fip01NCkddWj5GwWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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