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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb51c03161b48383693bb9e6e97995a6525c585e8483ead31f15c6ccebd787de' 
  AND token = 'lJCfOEXdyCIVauhA97j6/XsFr9Ew/9yOunLcx0Fs4EU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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