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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a18cc916bdb34999551f66b9bb8c373f0f6d47518df96e7bbedeea425aa1833a' 
  AND token = 'XbuyHrfXIMBhCzxx8n8fKN7mE0/NSvWQNgNXh1+r9dQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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