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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f93cff4d2767794eba4df4232a71f8985e97300482a77547d3ecb2cc0a240f93' 
  AND token = '3lVQIBvB5k8L7SxmruP0OO5bF3pnf6oYxhekUsX4uaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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