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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2d92d5cc5501dee3dd1f3befe4744028564ef5893e34e706bd4161be78e057a' 
  AND token = 'v8H2t72VmqQXewRv2oObOgbfV91UOidzESS7UrH1o0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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