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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f24d78bd1d2d65ffdf31132917a29f26ebebc8deecc155a6e65dda4eea229453' 
  AND token = '8QoQWD4OEHytqlrp5rla4KHbMm92qB3FYocvtno2VBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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