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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17816cf5ad1acebfc6058a75b1e172f193c22a909ecc524c5f5604715ed185e6' 
  AND token = '5hrqhOP2prMu0Sr0EEfEZLJVQmF6TRzfrlYT0rq3rik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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