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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9999c5c6f480bce3daa68c435b4317310ffd4ec825452b11d19a7cbcc22edc26' 
  AND token = 'pJkwbDlbjW89KxisTmn8fVDGWDcdo0Kfgcd365PS0go=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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