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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '567607a232d42db96132265cc9efdb99d0fe7c45350864978b158f02e9413fb8' 
  AND token = 'Xw8kZkG1EDWh9FqFQyUH5hNH5flE5OdVG8tnprXX8FI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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