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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b03fbe5d8ccb7fb1eaf30bab3d537ec4b2eb21ea8d328f19a3127317b7b8ecc' 
  AND token = 'HcFYp38OZVl6ca56+Cjle+P/ODDSupbrHjvY4hokd1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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