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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ff3592b5a2e0432c0a4f0300878e59af587f8da27fc6b7d6bc252b9d388d6ff' 
  AND token = 'PZzniKIX6+g28x7xHtLG+v/tP6D0opgU7FsrygSCrSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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