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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '790b212fc41f28862b5b79a93a399dbfe90a5a40074d73f240b30e548cf4a268' 
  AND token = 'osu6Vo8GJkVQ/hcoS4HLeyV/FcVR0lohlTL7pRANpBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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