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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c84059c7e6d7735eb993a809913ef0b57a0921b0644a9ff2ac33337e326859d1' 
  AND token = '9giHdGQXNsm5IuSV35PooDf8pSOvIfrcRW/adMZnBKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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