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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5147170633f91c7e21af5087882b2461f74cf99469398c304761a4dfccc70c0' 
  AND token = 'J54fd3PCTNYQZn2Ce1BuvFX9TDMZFosSDrmiBNv64NI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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