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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd76cf8b80332ac55ed883c10a7d382aeaed0d0b9f6fc6193c366bc211ce8fdd8' 
  AND token = 'eUMt9+StMj/WnMAXnxQL07I52CHwtPIWu7Gt41PX0Qg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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