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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2529c04cbf3a9e3acd9a5630bdef7d836fdea1b9247b86d95b9d53393b6cf176' 
  AND token = 'ySCtixiU/Fe9/HyIADmqBpA7B91g1TTJYfmzSYIu0dU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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