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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e475ddc45558af20b7aa84c6959e7d17e175a88ca1fbf888532e763716335230' 
  AND token = 'nJv2ccFFLE0sqnxfs1pKXgTnP3g0cxB5qTZEf/sFCFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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