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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcea7a5cff14baed7ea958d02e7bb8d7afea498989e076c93269d09c1f3e5e5c' 
  AND token = '9hYRgOeSKccy7/ut7YFUrQ3oE5yXBRh/cyLR20hIm+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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