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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abbe89c6ae5b34f2510f50ee656047670a66b952224ecf93ba2a24c35375bff7' 
  AND token = 'tPWvwr8xl9i5W1xboxBb1WG9KkULn+yiP2WHx37wdbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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