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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fd87f53bea80792b77d8d73d1362fa1824eb3d2cc2ebe2067732e51ca63c9d0' 
  AND token = '4agkrPvxLOzB6Z5YOF5XbKT/KXavzgKKP/OTJe9/85Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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