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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd934c31f98b19e8d83523ff5535201c5287038a95a50175cdd6f43304a19740e' 
  AND token = 'Qgkxiu2E8B8PdHkZMbT1Wq6rrR1CZXFaIK1taluTNik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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