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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '237ffd7f25d80ba0f22c8f74363133a2848a6054cb0bfeb8ed1cce4b4e3007c4' 
  AND token = 'N1OaVA/7u8aAaWGRDcYW2z6J/l7kDKMhbRhloOCcris=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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