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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69b9a9fd51fed7b1d79c4dcd8ca41d5419917653ef4193e9245cd774d7f22346' 
  AND token = 'V96umVYt6o3LM3b1Gn3+1rcCqQ5ZLz1sk3VLQBQTzrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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