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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f717e8b0506b249c1e8ca0c53ac9a47f8ff1c4adbb7c048870294a31a09ea83' 
  AND token = 'juKYiWPwITsfr9AlJgDdnheMcEIscYHc9mpe3GD3Ikc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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