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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06a3c612336ff2f6cdc30a7460f1a94b284d8a14c437df1c1f4904206e58517b' 
  AND token = '1Os4mzKT19MJMoDtIQTnbt/vWeJDmUhq4/J6fFjiw48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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