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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ec3d76b22ec68c2bc684cee88ea615adb198f8d704097422748c878c47acb4a' 
  AND token = 'dzJtO89v48j+i/+eeq8V95kQTnUvEKaEWN1aLESb32E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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