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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30b99a3d92d1582260a276964b6d4587b90bfaaa71ec0fc9410e3fe215cfbc71' 
  AND token = 'iokRybOCcVjBRblDQweTUrtGDZp4pLf66eHLxH5Y1vU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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