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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e73602e9336099cbfff11228d6aef34914f33bb5ad78637c8abb3f51c468ad4a' 
  AND token = 'kYNs/1GWhFxWiidWKu1wKebirzee/GMS7fI3A5sOo8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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