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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d7bf9d0ea2c49ef9ceaf4d3c80f2b93fbe58e9c0e52071e1a0b86508bb97e01' 
  AND token = 'C97xy05LzYKWVbxTt2usEZiYkUvdqclXg/YccgpjKk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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