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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac032f20711d9d3e68515fa28935835e6fb1d2470ff56c120a6223e19f9f5dc5' 
  AND token = 'swW0fXxK7Hz2azZwv2qCvEvhnuavg9fk9c4l7EJh+Co=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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