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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92c7f7c7e84461942aad7d9da2c165d0ebde7e585e751490a7f967562a22ab2e' 
  AND token = 'uzbulFne6/b2OO2jY1HE6LJRbW40rmGzAn/HozioxMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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