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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba0afb249e39c19cd7d08d7f3aafae4b22cf5ddf702a04e697e005d6fb07614e' 
  AND token = 'NM2B9o3NeS/zpe8hkUWeuuVKVrwExE9774Rt6zEueLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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