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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f652d9ed433ad176e7ba91acdd719082d13da76208c84349f1666de9c1d62638' 
  AND token = 'Kw4lpAMAEUldWCy2qxMVQ2OLBZpyrvhGT/0XQnO2Gbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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