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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5673e2216edbdbc2362afae007d776f066bf539c7659011774567e77ab13611e' 
  AND token = 'W2zjkU1xw9Iuf0Mvbi0klF/KY3cFnDtJeIGQGve4SR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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