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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8683d1f40ce42126847d4c2450bc2a32eed760431a70ebab18e1d528fc52349' 
  AND token = 'pjgAS5yFgwK8qP1zx0ygOMqqfSy2F2F6rRqvjgwKzhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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