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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f79d158deaee509b703f73a51cdb60d2d6a4a7ddc64aa6551cf571e3368b514' 
  AND token = '0d1q8wwnfsVl+yummVyGQ7x8zk0nyhwx5gVQDsMP0ow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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