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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cc3d1b3b6bce4f809d2a8d0add97ec1b64dc7790eeb4c056073fc2374c13cbc' 
  AND token = 'anS9L4PY2MrM+eLGyXGP4yJXUoAj8Jweku2LrJU3CHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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