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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e31cb10762a95c28577b5a368a98d7474ab3995f205c7926049c1600d5e8dce8' 
  AND token = 'eI9sUhwVDLQO+N0G8nbpioaa4MCJ5DqLIINfUJQ2sUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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