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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63a8ee8ecb43b77884d9d8eb1a67cd5592f47807a0c88d551be3b8f52a55631f' 
  AND token = 'dGS1Eb20Fz4OErI0DDFvyWCZXtt57DN/5D5vGbZJrPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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