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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79d59a01857231f185f3e06a5894f93c42377eb07bf54cefd9a7820e3e272ed5' 
  AND token = 'fp5Jlrxjsv+hLV6cBA9sDpFNO2JFh16oqaowjt0l0NI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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