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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb795f4df63cfa1c796f335890417aff364bd78ba98ef0af86aef54fbba7f8f9' 
  AND token = 'DGWwpDpVOHlv4S4wbVvrgLal16SJCcP6dlWkQyk99KU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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