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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70cc7603fc337a18aa06d94a8b7b7d74879b301e0a36f8a038fcc200b29451ff' 
  AND token = 'gmgg8sUzMFXW1fEmy47zoKjh9ZCk+Gkmyg+WPznv0oQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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