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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e7fd4af276838a898044fca2bc8c0aef7ffb2d99dbe285467e89ff8aba2ada2' 
  AND token = 'IcYRbyHIgzXoN7LiP6qNxILPZ6gltB+DXwtaT30KrCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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