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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af3db710299ebff02486693480c44d5d3a14b4602babfd9edba1b7c6aff83046' 
  AND token = 's/6fFfbm78GckYXHddAFfViln/Q9AkmxV+EZPGiTsd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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