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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e649e65a60d049acbb04bc583dac056472a242c53bed31d0a0ab2fcd674c9980' 
  AND token = 'kBjVOMV9Ajf4TdZca0xGBdgpd0JnFdUwhk/Tjcn8pQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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