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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '711a00ed61b9188194928629a1ec15c58a58de203e14aa9e5c9e031bfed963f4' 
  AND token = 'ldbLnMOdIuWxCwwC/5nuMspb+gbWDv9U7GVaI7GnVpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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