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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83426652b8ad25c485667a8892e07fce68e47a88598717dc713375704169ca4d' 
  AND token = '2InpdDhyzx02LIXV/Sw+hnWtra0Ubo0hZkED4637tp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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