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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24243084d1f22b9855d1aa96981bb32bdba743a8ba48fca6e3f00aed2a1749b4' 
  AND token = '828Ik9Axryr0ItsAZGOmlvsa6eXTzgNQPaDaToYCxYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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